Drilling machine



July 12,1927.

. G. H. GILMAN DRILLING MACHINE Filed June 29 1921 l 3 Sheets-Sheet 1 'nl IHIIi 1 mm, hm 2Q QEQQ Q uw Y QQ f KM myv 12, 1927.

G. H. GIALMAN DRILLING MACHIE July 12,' `192-7.

1,635,475 G. H. GlLMAN DRILLING MACHINE Filed 913e 29 1921v is shea Patented July 12, 1927.

UNITED STATES GEORGE H. GILMAN, OF BELMONT, MASSACHUSETTS.

DRILLING MACHINE.

Application led June 29, 1921. Serial No. 481,417.

My invention relates to drilling machines and more particularly but not exclusively to a hammer rock drill.

The invention will be best understood from the following description when read in the light of the accompanying drawings of a specific embodiment thereof selected for illustrative purposes, while the scope of the invention will be more particularly pointed out in the appended claims.

Referring to the drawings Fig. 1 shows a longitudinal section through a hammer rock drill;

Figs. 2, 3, 4, 5 and 6 are respectively sections on the lines 2 2, 3-3, 4-4, 5-5 and 6-6 of Fig. 1; j

Fig. 7 is a section on the line 7-7 of Fig. 6;

Fig. 8 is a diagram representing the posie tions of the throttle valve; and

Figs. 9 and 10 are diagrams illustrating the operation of the machine.

Referring to the drawings, I have shown a casing which comprises a cylinder section 1, the chuck casing 3, the ratchet casing 5 and the rear head block 7, these parts or sections being held in assembled relation by means of the three through-bolts 9, extending through suitable perforated lugs 10 formed laterally of the members. For preventing angular movement between the main cylinder section, the chuck casing and the ratchet casing, I provide the dowels 11. These dowels are provided with flanges 13 entering and litt-ing the recesses 15 in the lugs 10 of the ratchet casing and with sleeve portions 17 which enter the recesses 19 in the adjacent faces of the cylinder section and chuck casing. The bottom of the recesses 19 are flared or are otherwise suitably formed to provide spaces into which the inner ends of the sleeves 17 vma-y be expanded to hold the dowels in position. The dowels thus formed surround the through-bolts 9 or it will be understood may be otherwise suitably formed to permit these bolts to pass by them.

As illustrated the cylinder section is provided with parallel bores 21 and 23, the same opening through the rearward end of the section and being closed by the rear head block 7, while the portion of the cylinder forward of the` bores provides the front cylinder `head 25.

Herein, in the bore Q1 of the cylinder member is reeiprocably mounted, the head 27 of the hammer piston, and formed integrally with. the head is the forwardly projecting shank 29, the exterior cylindrical surface of which fits the bore 31 formed in the front cylinder head .25. This shank serves as a hammer bar and is arranged to strike the rearward endV of the shank 33 of the drill steel at the end of the forward movement of the piston.

The shank of the drill steelis shown polygonal in cross-section andis carried in the chuck 35, the latter being provided with tongues 37 'fitting the helical grooves 39 extending longitudinally along the hammer bar. Other longitudinally extending grooves 1l1, vwhich are preferably straight, are formed in the hammer bar and receive tongues 43 formed integrally with the ratchet ring 45, the latter being provided with ratchet teeth 47 engaging the pavvls 49. These pa-wls have perforated bosses 51 through which the through-bolts 9 extend and which bosses fit the bore of the perforations 15 of the lugs 10 on the ratchet casing. The opposed faces of the flanges 13 of the dowels 11 provide bearing surfaces for the pawls. By means of the construction just described, the ratchet ring is prevented from rotating when the piston moves rearwardly, which causes the helical grooves in engagement with the chuck to rotate the ldrill steel.

Any suitable means for conducting cleansing fiuid to the drill hole may be provided and fer this purpose I have shown the drill steel provided with a bore 53 which extends from its rearward end face to the cutting point- For injecting water into the bore of the drill steel I provide the usual water tube 55, while air is admitted to the drill steel from a passage 57 inv communication with an annular groove 59 formed in the interior surface of the bore 31.` From this groove, the motive fluid passes along the grooves 39 and 41 into the Vchuck chamber 61 at the rear of the drill shank and finds its way into the bore 53 of the drill steel, the flow being more or less restricted by the tongues 37 and 43 of the ratchet ring and chuck fitting these grooves.

For controlling the admission and exhaust of motive fluid to the cylinder chamber at opposite sides of the head 27, I herein provide a distributing valve G5, the latter being tubular or otherwise formed to provide an open ended conduit in communication with tion of parts when the passage 139 is con` l around the hammer bar or along the grooves formed therein and at the same time provides a convenient means for augmenting the supply to the forward end of the cylinder.

For lubricating the machine the handle 110 which is made integral with the rear cylinder head is shown as provided with a lubricant reservoir 111 and tor distributing lubricant from the reservoir for lubricating the moving parts ot' the machine l provide the plunger 113 havingl the reduced diameter portions 115 and 117 andr mounted to reciprocate in a cylinder provided by the bore 119 formed in the rear cylinder head. This bore is provided with a portion ot enlarged diameter 121, which forms a shoulder against which the end ot the sleeve 123 inserted into the bore abuts, the sleeve being held in position by a plug 125. The opposite end of the boref119 is closed by a similar plug 127 having a stop 12S for determining the outward limit of movement of the plunger and between the inner tace oit the plug and the lacing end of the plunger is mounted a `compression spring 129 which acts to normally hold the plunger `against the end ot the sleeve 123. Leading from the reservoir -to an intermediate portion of the cylinder for the plunger is a passage 131, while other passages 133 and 135 communicating with the cylinder on opposite sides ot the point of communication of the passage 151 respectively place the cylinder' in communication with the rear intake and exhaust passage S9 and the interior ot the ratchet chamber 5. The sleeve 122-3 is termed with a lateral port 137 in communication with a passage 139 adapted to be selectively connected by means hereinafter described to either live pressure fluid or to the atmosphere.

Referring to Fi 9, which shows the posinected to live air, the plunger is moved to compress the spring and move against the stop 128 carried by the plug 127. This places the chamber -formed bythe groove 117 of the plunger in comniunication with the passage 135 leading to the ratchet casing to supply lubricant to the latter and at the same time the chamber provided by the groove 115 is placed in conununication with the lubricant reservoir by way of the passage 131 to till such chamber. Vhen the passage 139 is connected to exhaust, the motive tluid at the upper end ot the plunger as viewed in Fig. 9 escapes and the spring 129 i'orces the plunger against the end ot the sleeve 123. This places the groove 115 in communication with the passage 133, which permits `the lubricant to passthrough the passage into the passage 89 leading to the cylinder and at the same time the passage y117 is brought in communication with the passage 131 to fill it with lubricant in order Vfor operating it and being seated in a casing connected at the end opposite the handle with the motive fluid supply connection 14,5.v

rihc valve is provided with an internal conduit 1417 opening through its end to place it in permanent communication with the supply connection and is provided with exterior slots 149 and 150 orrespectively placing the opposite exhaust passages 93 in communication with passages 151 leading to the atmosphere. The construction and operation of the valve is best indicated by Fig. 8, in which the .sections correspond to those on the line time, ZJ5, @-0, oZ-d and ee of Fig. 6.

is illustrated by the sections b-5, in the plane of the passages 57 and 67 respectively leading to the seal about the hammer bar and to the distributing valve, the internal conduit 1417 is placed in communication with the exterior ot the valve plug by radial passages 153 and 155, so that when the valve is moved to its first position from the neutral position, in the latter of which neither the pas- 57 nor 67 are supplied, the passage 155 will have moved into communication with the passage 57 in order to blow the drillhole. Further movement of the valve moves the passage 153 into communication with the passage 67 leading to the distributing valve but before this takes place interrupts the communication between the passages 155 and 57. For supplying the passage 57 with an amount olf air less than that necessary to blow7 the drill hole when the valve is in the full ruiming position, as is illustrated by the third position in Fig. 8, the valve in the plane ot thc section c c is provided `with a radial passage 159 placing the live air conduit 1117 in communication with the exterior et the valve and in communication with the passage 159 is the arcual groove 161 formed ou the exterior of the valve. The groove 161 is in communication with the .passage 57 whenever air is supplied the passage 67 and at all other times it is out of communication with the passage 57.

vThe exhaust is controlled as heretofore explained by means of the passages 149 and 150 'fornire-d in the throttle valve, and as illustrated by the second position ot the sections a and cl-(Z, the passages 93 are placed 'in communication `with the exhaust passages 151 just prior to supplying air to the passage 67 leading to the distributing valve and are full open when the valve is inthe third or full running position. In the first position when the hole is blown, ythe exhaust passa-ges are closed to insure that the air supplied will not escape' through the will be noticed that when exhausts-passages by Wayfof the grooves on 'he hamn'ier bar andthe cylindei.

As illustrated bypthesections e-e, the iiii ternalfconduit 1417 is'placed in communica- .tion with theaeXtei-ior of the valve by means of a lradialpassagew, while in the saine plane as tliepassage on the exterior surface of the valve is formed an arcual groove 165 and from the valve casing the passage 16T leading to the-atmosp cre. When the valve is moved to the second iosition, the aizcual giioove 165 places the passage 159 leading-tov thelubig'icator plunger chamber incoinmunicat-ion with the sphere by way ofthe 'patsagel which causes the lubricatorplunger to move to the end of its stroke oppositey that illustrated by 9. llhen'tlie valve isznioved tothe full running positioinliveair is supplied the passage 1239 by Way oli theipassage 13and communication'betiveeii the passage 139 and passage 167 is inter-rnpted,which supplies the lubricator plunger chamber with .motive fluid to move itto :the position:illustrated by Fig. 9. 1t the throttle valve shuts offthe supply ofair to operate the hammer, the lubricator chamber is exhausted I and the ratchet` mechanism is supplied with tions Serial No; 421,748, filed Novel-i lubricant, While `When the valve is moved to 1' supply air to operate the hammer, the valve isinovedto `its, opposite posit-ion to supply thefc'ylinder with lubricant.

This application is an improvement in .the rock 'drills shown-in my pending` applicaber Ll,

1920, SerialNo. 76,410, filed December 19, 1925,' and Serial No. 113,672, filed June a, 1926,1thelatter being aI division of my application Serial No. 386,868, filed June 5, 1920, which is non' lPatent No.` 1,588,407.

Although I have described one specific einbodiment'of my invention for illustrative purposes-.itis to be`Y understood that extensive deviations fi'oin tlie'samemay hefmade Without.departing from the spirit of my invention.

Claims: g

1.. In aa fluid pressure motor, a. cylinder,

a piston therein havingopposed Working surfaces,- ran imperforate tublarvalve having open-ends in'substan'tially unobstiucted fluid communication with eachother, a source of motive'fluid supply, conduit means placingA said source of supply in constantl communir cation with' the interior of said valve, pas si es controlled by vsaid valve for admittingv motive `fluidy to said cylinder for acting alternately on said opposed Working surfaces forv actuation of said piston, one of said passages including the` interior of said valve, said valve .being :provided with' separate surfaces facing linthe same direction, a' motive fluid conducting'passage-for conducting fluid for action fon one1of said surfaces -for creating a pressure conditionzthereon to inove said pasaiges controlledr by said valve for admitting motive fluidv to said cylinder 'for acting alternately on'said opposedzivorking surfaces for actuation of said piston, one of said passages including the interior of said valve, said valve being provided intermediate its ends with separate surfaces facing iii the saine direction, a motive fluid conducting passage leading -to one of said surfaces for creating a pressure condition thereon to move said valve, a poit controlled by said piston for admitting motiv-e .fluid yto said passage, and means for admitting motiv-e fluid to the other' of said surfaces to lock said valve when so moved.

3. In a flnid pressure motor, a cylinder, a piston therein having opposed VWorking surfaces, any iniperforate tubular valve having open ends iii substantially unobstructed fluid communication, said valve serving to conduct motive fluid for admission to said cylinder for actingon one-of said opposed surfaces for actuation of said piston in one direction, means adjacent an end of said valve for controlling admission and exhaust of motive fluid .to and from said cylinder for actuation of ysaid piston in one direction, said valve being provided with Aseparate surfaces facing in the same direction, means including l l admitting motive fluid to the other of said surfaces toA lock said valve in position When so moved. y

4l. In a fluid pressure motor, cylinder. a piston therein having opposed Working surfaces, an iinperforate-tubular valve having` open endsin substantially unobstructed fluid connnunication, said valve serving to conductinotive fluid for `admission to'said cylinder .for acting `on one of said opposed surfaces for actuation of said pistonin one direction, means adjacent opposite ends of said valve for controlling admission and exhaust of motive fluid to and froml said cylinder for acting alternately on said opposed surfaces for'actuation of said piston in opposite directions, said valve being provided With sepaiate surfaces facing` inthe same direction, means including a port controlled by4v said piston for creating' a pressure condition on V130 one of said surfaces to cause the valve to move, and means for admitting motive fluid to the other of said surfaces to loclr said valve in position when so moved." e

5. In a fluid pressure motor, a cylinder, a piston therein having opposed Working surfaces, an iii'iperforate tubular valve having openeuds in substantially unobstructed fluid communication` said valve serving to conduct motive Huid for admission to said cylinder for acting on one of said opposed surfaces for actuation` of said piston in one directioii, iiieaiis adjacent opposite ends of said valve for controlling admission and exhaust of motive fluid to and from saidcylinder for acting alternately on said opposed surfaces for actuation of said piston in opposite directions, said valve being provided intermediate its ends with separate surfaces facing in the saine direction, means including a port controlled by said piston for creating a pressure condition on 'one of said surfaces to cause the valve to move, and means for admitting motive fluid to the other of said surfaces to lock said valve in position when so moved. e

G. In a iuid'pressure motor, a cylinder, a pistontherein, an impeij'forate tubular valve having open ends in substantially unobstructed fluid communication, a passage controlled by said valve for controlling an event of the cycle of `said motor, said valve being provided exteriorly thereof With Separate surfaces facing in thesaine direction, a passage controlled by said piston for conducting inotive fluid from said cylinder to one of said surfaces to move said valve, and means responsive `to the movement of said valve for admitting live actuating fluid to the other of said surfaces to lock said `valve when so moved. a i i i 7 In a fluid pressure motor, a. cylinder, a piston therein,` ran iiiiperforate cylindrical tubular valve having open ends in substantially unobstructed fluid couiii'iunication, a passage controlled by said valve for controlling an event of thecycle of said motor, said valve being provided exteriorlythercof with separatesurfaces intermediate its ends facing in the same direction, means for conducting n'iotivefluid from said cylinder to one of said surfaces to move said valve, and means responsive to the moveiiieiit of said valve for admitting fluid to the other of said surfacesI to lock said valve when so moved.

8. Iii a fluid pressure motor, a cylinder, a piston therein having opposedV Working surfaces, a source of Amotive fluid, a tubular valve for admitting motive fluid from said source alternately toV said cylinder for acting alternately on said opposed surfaces for actuationof said piston.` valve provided With a plurality of surfaces 'facing in one direction and a plurality of surfacesfacing in the opposite direction, means placing the interior of said valve in constant communication With said source, ports and passages controlled by said piston for alternately creating a pressure condition on oppositely facsaid oppositely facing surfaces to lock said valve when so moved.

E). In a fluid pressure motor, a cylinder, a piston therein, a source of motive fluid supply, an imperforate tubular valve provided with a plurality of surfaces facing in'one direction and a plurality of surfaces facing in the opposite direction, means placing the iiiterior of said valve in constant communication With said source, means including ports and passages controlled by said piston for alternately adiiiitting fluid from said cylinder to oppositely facing surfaces to move said valve in opposite directions, and means responsive to motion of said valve for admitting fluid to other of said oppositely facing surfaces to lock said valve when so moved. s l0. In a fluid pressure motor, a` cylinder, a piston therein, a source of motive fluid supply, having opposed surfaces, an imperforate tubular valve, means placing the interior of. said valve through one end thereof in constant con'in'iunication With said source, means adjacentthe ends of said valve for controlling the admission of motive fluid to sai-d cylinder for acting alternately on said opposed surfaces, a plurality of surfaces on said valve facing in one direction, a plurality of other surfaces facing in the opposite direction, all of said'surfaces being intermediate the ends of said valve, means responsive to motion of said piston for alternately creating a pressure condition on oppositely fac- .ing surfaces to move said valve in opposite directions, and means responsive to motion Iof said valve for admitting fluid to other of said oppositely facing surfaces lto lock said valve When so moved.

ll. In a fluid pressure motor, a cylinder, a piston therein, having opposed surfaces, ya

source of motive fluid supply, an imperforate tubular valve, means placing the interior `of said valve through `one end thereof in constant communication with said source, means adjacent the ends of said valve for controlling the admission and exhaust of motive' fluid to and from said cylinder for acting` alternately on said opposed surfaces, a. plurality of surfaces on said valve 'facing in one direction, a plurality of other surfaces fac.- ing in the opposite direction, all of said surfaces being intermediate the ends of said valve, means including ports and passages controlled by said piston for alternately creating a pressure condition on oppositely facing surfaces to move said valve in opposite directions, and means responsive to motion of said valve for admitting fluid to other of uio said 'oppositelyfacing surfaces to lock said valve vwhen. so moved.

.12.fln a" Huid pressuremotor, a cylinder, a piston therein having opposed surfaces, a `source of motive fluid supply, an imperforate tubular valve, means placing` the interiorof said valve through one end thereof in constant communication With said source, meansadjacent the ends of said valve for controlling the admission of motive Huid to sadfcylinder for acting alternately on. said opposed surfaces, a plurality of surfaceson said valve facing in one direction, a plurality of other surfaces facingin the oppositeY direction, all of said surfaces being intermediate Vthe'endsof said valve, means responsive to motion of said piston for alternately admittingffluid from 4said cylinder on oppositely .facingsurfaces to move said valve in opposite directions, and vmeans responsive to motion ofsaid valve for admitting fluid to othervof :said oppositelyy facing surfaces to lock ,said valve When so moved.

13.f In a fluid operated motor, a cylinder, apiston therein, a cylindrical valve, means connecting a source of motive fluid to opposite ends of said valve, exhaust ports adjacent said` ends, cylinder supply and exhaust `ports .intermediate saidends and said eX- haust ports, oppositely facing shoulders on said valve adjacent each end, one of said shoulders being in constant communication with the adjacent-exhaust passage and the other.l alternately in communication with said exhaustpassage and saidsource, and means responsiveto the motion ofsaid piston for moving said valve.

. 14. In a fluid operated motor, a valve casing, a valvev having aninternal conduit, means permanently connecting said conduit to a-source of motive fluid supply, an eX- haust port communicating with said casing, a cylinder supply and exhaustl `'port communicating with said casing, means providing oppositely-facing shoulders on said valve adjacent said ports, one of said shoulders' being in constant communication with said exhaust-port, ymeansfor moving said valve,

and `means responsive to such movement'for placing the other of said shoulders in communicationl with said source and the inte- -rior of said valve in communication With said cylinder supply and exhaust port.

Yl5. In a fluid operated motor, a cylinder, a valveand its casing, a passage. connecting said casing with an end of said cylinder, an adjacent passage connecting` said casing With the atmosphere, a third passageconnecting said casing to ay source of motive fluid supply, means for moving said'fvalve alternately into two positions, said valve and its casing formed topi-Ovide means for connecting said firstmentioned passage to saidv third passage vvhen said valve is in Vone of said positions and to said adjacent passage when inthe other ofsaid positions, said'means provid= ing a pair ofoppo'site'ly'facing surfaceson said valve, one of said surfaces being in constant communication with said first menf tioned passage andv the other in constant communication With said adjacent passage.

16. A fluid pressure motor having, in combination, a cylinder having parallel bores and a piston' having opposedworkingsurfaces in one of said bores, a'tubul'ar valve inthe other of said bores, said' va'lve having open ends inV fluid communication with each other by Way 'ofthe interior of'said valve, passages connecting 'the' bore containing said valve at opposite endportionsilthereofWith' for said valve at opposite ends thereof having` cooperating 'portions controlling vvadmission of motive fluid alternatelyto saidpassages aroun'dl'the ends fofthe' valveA including a' part up-on's'aid 'valveexposed to the motive fluidon'ly when said 'motive fluidi isV flowing into the associated passages. Y

17. In a-luid pre'ssure'motor, ar cylinder, a piston .th'erein,x an Aopen `endedreciprocatory tubular valve, arsource 'of 'motive fluid connected vto an end vof'said valve," a valve casing, passages leading Vfrom said casing to oppositeends of :said cylinder, means for reciprocating said 'valve in syn'chionismvvith said piston, saidvalve vand its casing being constructed 'With' cooperating valve faces andvalve 'seats to cause said valve to connect said passages alternately .to `said source,fa passage adjacent each of said first named passages 'placing' saidl valvel casing vin* communication Withr vthe atmosphere, and 'an annular projection carried 'by saidl valve 'adjacent eachof the pairs of passages soiformed, means formoving lsaid valve to `cause said projections lalternately'to establish' and interrupt communication between the passages ofy each pair, and saidprojections being so formed and disp'osedxas to move into the passage leading` to" the cylinder of each pair when such communication'is established.

18. In a fluid' pressure motor, a cylinder, a cylindrical valve, a l:casing for said valve, conduit means connecting saidrcasing to an end portionl of'said cylinder,fsaid valve and casing-affording means for' alternately connecting those ends of saidconduit'means inY communication with said casing to a source of 'live motive fluid and to the atmosphere, a lockingsurface for said valve in constant communication with said conduit means, pressiufe surfaces on said valve other than said locking surface, and means for creating pressure conditions on the last named sur faces to cause said valve to move.

19. A percussive tool having, in combinan tion, a cylinder, a piston having a head and a shank, a cylinder having large and small diameter portions fitting said head and shank, means controlled by said head for admitting motive fluid directly to said large diameter portion of said cylinder 'for acting upon said head for moving the piston inone direction, and means controlled by said shank for admitting motive fluid to said large diameter portion of said cylinder by Way of said Asmall diameter portion of said cylinder for acting upon said head for moving said piston in the same direction.

20. A percussive tool having, in combina tion, a cylinder, a piston having a head and a shank, a cylinder having large and small diameter portions fitting said head and shank, a fluid actuated valve controller by said piston for admitting motive fluid directly to said large diameter' portion of said cylinder for acting upon said head for moving thepiston in one direction, and means controlled by said shank for admitting motive fluid to said large diameter portion of said cylinder by Way of said small diameter portion of said cylinder for acting upon said head for moving said piston in the same di rection.

2l. In a rock drill, a cylinder, a hammer rcciprocably mounted in said cylinder, a valve for admitting motive fluid to an end of said cylinder for initiating motion of said piston, and means controlled in response to motion of said piston so initiated for admit ting additional motive fluid to the same end of said cylinder.

22. ln a rock drill, a cylinder, a piston having a head ,portion and a shank portion, a valve for admitting motive fluid to act on one of said portions for initiating movement of said piston, and means directly con-- trolled by the other of said portions for admitting motive fluid to act on the said one portion after such initiation ot' movement.

23:5. ln a rock drill, a cylinder having com mimicating larger and smaller diameter portions, a piston in said cylinder and having` a head and a shank respectively fitting said larger and smaller diameter portions, a source ,Y aseous motive fluid supply, means for admitting motive fluid from said source lo the large diameter portion of said cylinder for reciprocating said piston, and a gaseous seal about said shank for preventing escape. of motive fluid from said larger diameter portion past said shank.

2li. ln a rock drill, a cylinder having communicating larger and smaller diameter portions, a piston in said cylinder and having a head and a shank respectively fitting said |'larger and smaller diameter portions, a source of gaseous motive fluid supply, means for admitting motive fluid from said source to the large diameter portion of said cyliir der for reciprocating said piston, a gaseous seal about said shank for preventing escape of motive fluid from said larger diameter portion past. said shank, and means controlled by said shank` for at times placing said seal in con'imunication with said larger diameter cylinder portion.

25. in a rock drill, a cylinder having com municating larger and smaller diameter portions, a piston in said cylinder and having a head and a shank respectively fitting said larger and smaller diameter portions, a source oit' gaseous motive fluid supply, means' for admitting motive fluid from said source to the large diameter portion of said cylinder for reciprocating said piston, a gaseous seal about said shank for preventing escape of' motive fluid from said larger diameter portion past said shank, conduit means for conducting fluid to the drill hole, and means for establishing communication between said seal and said conduit means.

26. In a rock drill, a cylinder having larger and smaller diameter portions, a piston having a head fitting said larger diameter portion and a shank provided with a. longitudinally extending groove and fitting said smaller diam-eter portion, means placing said groove in continuous communication With a source of live motive fiuidsupply, and means for moving said groove into and out of comn'iunication with said larger diameter cylinder portion.

27. in a rock drill, a cylinder vhaving larger and smaller diameter portions, a piston having a head fitting said larger diameter portion and a shank provided With a longitudinally extending groove and fitting said smaller diameter portion, means placing said groove in coimnunication with a source of live motive fluid supply, means 'for mov ing said groove into and out of communicrtion with said larger diameter cylinder portion. a drill steel having a bore and operated by said piston, and means for establish.-

communiration between said groove and the bore of said steel. Y

E28. in a rock drill, a cylinder having larger' and smaller diameter portions, a piston having a head fitting saiddarger diameter portion and a shank provided with a longitudinally exten-ding groove and lit-V ting said smaller diameter portion, conduit means placingl said groove in continuous comuninic-ation with a source of motive fluid supply, means for moving said groove. into and out of connnrmication with said larger lulu diameter cylinder portion, a chuck, a ratchet for rotating said chuck, and one or the other of said chuck and ratchet having a tongue co-operating with said groove.

29. In a rock drill, acylinder having larger and smaller diameter portions, a piston having a head fitting said larger diameter portion and a shank provided with a. longitudinally extending groove and fitting said smaller diameter portion, conduit means placing said groove in continuous communication with al source of motive fluid supply, means for moving said groove into and out of communication with said larger diameter cylinder portion, af chuck, a ratchet for rotating said chuck, one or the other of said chuck and ratchet having a tongue cooperating with said groove, a 'drillr steel having a bore and operated by said piston, and means .for establishing communication between said groove and the bore ot said steel. Y

30. In a rock drill, a casing, a piston in said casing having a hammer har, said casing having provision for carrying af hollow drill steel, a passage formed in said hammer bar for conducting motive fluid to the bore of said steel, motive fluid distributing means for actuating said piston, valvular mechanism for controlling the motive fluid supply to said means, valvular mechanism for controlling a supply to said passage, and means coordinating said valvular mechanisms whereby said passage and distributing means maybe simultaneously supplied or the former supplied to the exclusion of the latter.

31. In a rock drill, a casing, a piston in said casing having a hammer bar, said casing having provision for carrying a drill steel ha'ving a bore, a passage formed by said hammer bar for conducting motive fluid to the bore of said steel, motive fluid distributing means 'for actuating said piston, valvular mechanism for controlling the inotive fluid supply to said means, valvular mechanism for controlling a supply to sa'id passage, and means coordinating said valvular mechanisms and so constructed and arranged to supply both said passage and distributing means simultaneously or to increase the supply to said passage and to interrupt the supply to said distributing means.

32. In a drilling machine, a cylinder member having integral portions providing parallel bores, a handle member for said cylinder member and located rearwardly ofthe same, a piston in one of said bores, an open ended tubular valve .in the other of said bores and ttor controlling the admission to opposite ends of said cylinder, said valve having its ends in fluid communication by way of the interior of said valve, a motive fluid supply connectionv at the end of said valvev remote from said handle, and a throttle valve for said supply connection and located forwardly of said valve.

33. In a drilling machine, a cylinder member having a front cylinder head carrying a throttle valve, parallel bores in said member each opening through the rearward end thereof, a' member extending over the open ends of both bores, a tubular valve in one of. said bores, a piston in the other of said bores, and a motive iiuid connect-ion between said throttle valve and tubular valve.

3a. In a rock drill, a casing having provision for carrying a drillfsteel, a hammer piston in said casing, a rotary chuck carried by said casing, means `for rotating said chuck comprising a ratchet ring surrounding said hammer piston, a@ pawl cooperating with said ratchet ring, said casing being sectional and comprising a section .surrounding said ratchet ring, a bore in said section containing said pawl, a'n aligned bore in the adjacent' section, a sleeve fitting both bores and providing an end bearing for said pawl, a side bolt for holding said sections together, said side holt passing through vsaid sleeve and pawl.

35. ln a rock drill, a cylinder, a piston in said cylinder, conduit means for establishing comn'innication between the interior of said cylinder and the atmosphere, a chuck formed for carrying a hollow drill steel,

hammer bar carried by said piston and eX- tending into said chuck, a conduit means formed in said hammerbar and leading to lthe interior of said chuck, conduit means leading to the interior of said cylinder for conducting fluid thereto from a source of motive i'luid supply, and means for preventing flow through said first and last named conduit means and connecting said source to said second named conduit means.

36. A hammer rock drill having in combination, cylinder, a hammer piston in saidV cylinder, a valve casing, a reciprocatory tubular valve in said casing, said valve having open ends inr fluid communication with each other, a motive fiuid supply connection for constantly supplying the interior of said valve with motive 'fluid through one end thereof, said valve being` arranged with its axis substantially parallel to the axis of said piston, passages connecting said casing at the end portions of said valve with the adjacent end portions otL said cylinder, passages connecting said casing with the atmosphere and communicating with said casing at points adjacentthe points ot communication of said vfirst named passages with said casing and between said last named points and the longitudinal. center o't said valve, valve seats on said casing at the ends of said. valve, the end portions of said valve cooperating with said seats for alternately establishing and interrupting communication between said passages connecting said casing with the end portions of the cylinder and the motivev fluid supply,

valve seats on said casing between the last named passa es and said passages connecting said casing with the atmosphere, annular enlargements at the end portions of said valve cooperating with said last named valve seats for alternately establishing and interrupting communication between said passages and oppositely facing pressure surfaces on said valve and cooperating conduit means directly controlled by said piston for reciprocating said valve.

37. A rock drilling machine having in combination, a cylinder having a large diameter bore and a small diameter bore, a hammer piston having a head fitting said large diameter bore and a hammer bar litting said small diameter bore, a chuck, mechanism for causing said hammer piston by its movement to rotate said chuck, said mechanism including grooves on said hammer bar which establish communication between the forward end of said cylinder and said chuck, an annular groove in the surface of said smaller diameter bore, a motive fluid supply connection for said machine, means for alternately admitting and exhausting motive fluid from said supply connection to and from opposite ends of said large diameter bore, and conduit means in communication with said motive fluid supply connection for supplying live motive fluid to said annular groove.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN. 

